The FA has accepted there are "different circumstances" attached to April's FA Cup Manchester derby at Wembley, but are confident it will not cause difficulties.United take on City in their last four clash over the weekend of April 16 and 17, with Stoke and Bolton contesting the other tie.
Aside from the logistics of getting two sets of rival fans from the same city down to the capital by the same routes, there are other considerations for that weekend.
The London Marathon is being held on Sunday April 17 while Arsenal host Liverpool in the Barclays Premier League the same day.
